EP2458944A1 - Dispositif d éclairage - Google Patents

Dispositif d éclairage Download PDF

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Publication number
EP2458944A1
EP2458944A1 EP10802212A EP10802212A EP2458944A1 EP 2458944 A1 EP2458944 A1 EP 2458944A1 EP 10802212 A EP10802212 A EP 10802212A EP 10802212 A EP10802212 A EP 10802212A EP 2458944 A1 EP2458944 A1 EP 2458944A1
Authority
EP
European Patent Office
Prior art keywords
power
supplied
light source
control signal
power unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10802212A
Other languages
German (de)
English (en)
Other versions
EP2458944A4 (fr
Inventor
Noriaki Terazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of EP2458944A1 publication Critical patent/EP2458944A1/fr
Publication of EP2458944A4 publication Critical patent/EP2458944A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Definitions

  • the present invention relates to a lighting apparatus that includes a power unit externally supplied with power and a light source to be lit with power supplied from the power unit and has a structure to control a light quantity of the light source on the basis of a control signal externally supplied.
  • an incandescent lamp, a fluorescent lamp or the like is conventionally used as a light source. Since the brightness of a light emitting diode (hereinafter referred to as an LED) has been improved and a blue LED has been developed recently, a white LED obtained by combining a blue LED and a phosphor has been put to practical use, and accordingly, an LED having characteristics of compactness, small power consumption, a long life and the like is used as a light source for the lighting.
  • an LED light emitting diode
  • a lighting apparatus having a structure in which the light source may be dimmed in accordance with a control signal such as a dimming level control signal supplied from external equipment such as a dimming level controller is widely used.
  • various lighting apparatuses having a structure in which the light source may be dimmed in accordance with a dimming level control signal supplied from external equipment have been proposed (see, for example, Patent Document 1).
  • a lighting apparatus disclosed in Patent Document 1 includes a power unit externally supplied with power and an emission unit to be lit with power supplied from the power unit, and the power unit controls the brightness of the emission unit in accordance with a dimming level control signal supplied from external equipment of a dimming level controller.
  • a lighting system having a structure in which a plurality of lighting apparatuses installed in the room may be dimmed by one dimming level controller provided on a wall or the like is employed.
  • Such a lighting system is generally constructed so that a dimming level control signal may be supplied to the lighting apparatuses by the dimming level controller and that power from an external power supply may be supplied through the dimming level controller to the lighting apparatuses.
  • Each of the lighting apparatuses is constructed to light its emission unit in accordance with the power supply to its power unit and to control the light quantity of a light source on the basis of the dimming level control signal supplied from the dimming level controller.
  • the dimming level control signal is supplied from the dimming level controller to the lighting apparatus, and the emission unit is lit with the output of 100% before emitting light with brightness in accordance with the dimming level control signal in some cases. In other words, it instantly shines brightly and darkens thereafter in some cases, which disadvantageously makes a user feel uncomfortable.
  • the present invention has been devised in consideration of the aforementioned circumstances, and an object of the invention is providing a lighting apparatus having a structure in which a light source may be lit after supply of a control signal so as not to make a user feel uncomfortable.
  • the lighting apparatus of this invention includes a power unit supplied with power; a light source to be lit with the power supplied from the power unit, a light quantity of the light source being controlled on the basis of a control signal; and lighting means for lighting the light source after the control signal is supplied.
  • the light source since the lighting means for lighting the light source after the control signal is supplied is included, the light source may be lit after the supply of the control signal, and hence, the light source is lit with a light quantity in accordance with the control signal from an initial stage. As a result, a user may be prevented from feeling uncomfortable.
  • the lighting apparatus of this invention in which a light quantity of a light source to be lit with power supplied from a power unit is controlled on the basis of a control signal, includes lighting means for lighting the light source after the control signal is supplied in order to allow the light source to light with a light quantity in accordance with the control signal from an initial stage.
  • the lighting means for lighting the light source after the supply of the control signal is included for lighting the light source with a light quantity in accordance with the control signal from an initial stage, the light source is lit after the control signal is supplied and the light source is lit with a light quantity in accordance with the control signal from an initial stage.
  • a user may be prevented from feeling uncomfortable.
  • the lighting apparatus of this invention includes a power unit externally supplied with power; and a light source to be lit with the power supplied from the power unit, with a light quantity of the light source being controlled on the basis of a control signal externally supplied, and power supply to the light source from the power unit is delayed, by predetermined time or more, from start of power supply to the power unit.
  • the power supply to the light source from the power unit is delayed, by the predetermined time or more, from the start of the power supply to the power unit.
  • the predetermined time is appropriately set, the light source may be lit after the control signal is supplied, and hence, the light source is lit with a light quantity in accordance with the control signal from an initial stage. As a result, a user may be prevented from feeling uncomfortable.
  • the lighting apparatus of this invention further includes a supply voltage detection part detecting a supply voltage externally supplied to the power unit; and a power control part controlling the power unit for supplying power to the light source in accordance with the detected voltage detected by the supply voltage detection part, and the power control part supplies power to the light source predetermined time after the detected voltage becomes a predetermined value or more.
  • the supply voltage externally supplied to the power unit is detected, and the power unit is controlled to supply power to the light source the predetermined time after the detected voltage becomes the predetermined value or more.
  • the predetermined value and the predetermined time are appropriately set, the light source may be lit definitely after the control signal is supplied, and hence, a user may be prevented from feeling uncomfortable.
  • the predetermined value is a minimum operation voltage of the light source.
  • the minimum operation voltage of the light source (more specifically, a minimum operation voltage of a circuit included in the power unit at which the light source is lit at the same time as the start of the operation of the power unit) is set as the predetermined value.
  • the power is supplied to the light source the predetermined time after that point of time.
  • the predetermined time is appropriately set on the basis of delay time of the control signal, the light source may be lit definitely after the control signal is supplied, and hence, a user may be prevented from feeling uncomfortable.
  • the lighting apparatus of this invention further includes a supply voltage detection part detecting a supply voltage externally supplied to the power unit; and a power control part controlling the power unit for supplying power to the light source in accordance with the detected voltage detected by the supply voltage detection part, and the power control part supplies power to the light source when the detected voltage is not less than a set value.
  • the supply voltage externally supplied to the power unit is detected, and the power is supplied to the light source when the detected voltage is not less than the set value.
  • the light source may be lit after the control signal is supplied under simple control through determination with one threshold value, and a user may be prevented from feeling uncomfortable.
  • the set value is a value of the supply voltage supplied to the power unit when the control signal is supplied.
  • the light source since the value of the supply voltage supplied to the power unit when the control signal is supplied is used as the set value, the light source may be lit after the control signal is supplied, and a user may be prevented from feeling uncomfortable.
  • the power control part gradually increases (or gradually decreases) a current and/or a voltage to be supplied to the light source in accordance with start (or finish) of power supply to the power unit.
  • the current and/or the voltage to be supplied to the light source is gradually increased (or gradually decreased) in accordance with the start (or the finish) of the power supply to the power unit.
  • the current and/or the voltage to be supplied to the light source is gradually increased from 0 in accordance with the start of the power supply to the power unit, so as to light the light source at a dimming level in accordance with the control signal after predetermined time. Accordingly, a user may be prevented from feeling uncomfortable.
  • the light source is an LED.
  • dimming level control may be finely performed by changing the light quantity (i.e., emission intensity) by changing the current and/or the voltage.
  • a light source is lit after supply of a control signal, a user may be prevented from feeling uncomfortable.
  • FIG. 1 is a block diagram illustrating a schematic structure of a lighting system including a lighting apparatus according to Embodiment 1 of the invention.
  • the lighting apparatus 100 of Embodiment 1 includes a power unit 1 connected to a dimming level controller 200 and supplied with power by the dimming level controller 200; a dimming level control unit 2 connected to the dimming level controller 200, supplied with a control signal by the dimming level controller 200 and supplying a signal in accordance with the supplied control signal to the power unit 1; and an emission unit 3 connected to the power unit 1 and lit with power supplied from the power unit 1.
  • the dimming level controller 200 has a connection terminal to be connected to an external power supply such as a commercial power supply and an output terminal for outputting power and the control signal, that is, a dimming level control signal, to the lighting apparatus 100.
  • FIG. 2 is a block diagram illustrating a schematic structure of a principal part of the lighting apparatus 100 according to Embodiment 1 of the invention.
  • the power unit 1 includes a noise filter circuit part 11 for removing noise included in an AC current.
  • One end of the noise filter circuit part 11 is connected to the output terminal of the dimming level controller 200, and the other end thereof is connected to one end of a rectifying circuit part 12.
  • the noise filter circuit part 11 prevents inflow of noise included in an AC current supplied from the commercial power supply through the dimming level controller 200 and outflow of noise to the commercial power supply through the dimming level controller 200.
  • the rectifying circuit part 12 is, for example, a diode bridge, and performs full-wave rectification of the AC current from which noise has been removed by the noise filter circuit part 11.
  • the other end of the rectifying circuit part 12 is connected to a smoothing circuit part 13, and the smoothing circuit part 13 performs smoothing for suppressing variation of the power supplied from the rectifying circuit part 12.
  • the other end of the smoothing circuit part 13 is connected to a switching circuit part 14, and the switching circuit part 14 is supplied with the power having been smoothed by the smoothing circuit part 13.
  • the switching circuit part 14 performs a switching operation with the power supplied from the smoothing circuit part 13, so as to step down a supply voltage of, for example, 100 V to a supply voltage of 35 V
  • the switching circuit part 14 is connected to a constant current control part 15 and a constant voltage control part 16.
  • the constant current control part 15 is constructed to control a current supplied to the emission unit 3 to be kept at a set value. In other words, it performs feedback control for keeping constant the current supplied to the emission unit 3 from the power unit 1 by controlling the switching operation of the switching circuit part 14 so that the output current supplied from the switching circuit part 14 may be a set value (for example, by stopping the switching operation of the switching circuit part 14 when the output current supplied from the switching circuit part 14 exceeds the set value). It is noted that the set value of the current is given by the dimming level control unit 2 described later.
  • the constant voltage control part 16 is constructed to control a voltage supplied to the emission unit 3 to be kept at a set value. In other words, it performs feedback control for keeping constant the voltage supplied to the emission unit 3 from the power unit 1 by controlling the switching operation of the switching circuit part 14 so that the output voltage supplied from the switching circuit part 14 may be a set value (for example, by stopping the switching operation of the switching circuit part 14 when the output voltage supplied from the switching circuit part 14 exceeds the set value). It is noted that the set value of the voltage is given by the dimming level control unit 2 described later.
  • the rectifying circuit part 12 of the power unit 1 is connected to a supply voltage detection part 17.
  • the supply voltage detection part 17 detects a supply voltage to be supplied to the power unit 1 from the dimming level controller 200 by detecting a voltage supplied to the rectifying circuit part 12.
  • the supply voltage detection part 17 is connected to a power control part 18, and the power control part 18 is supplied with a supply voltage value detected by the supply voltage detection part 17.
  • the power control part 18 is connected to the switching circuit part 14.
  • the power control part 18 is constructed to control the switching circuit part 14 in accordance with the supplied supply voltage value as described later.
  • the power control part 18 functions as lighting means for lighting the emission unit 3 corresponding to a light source after a control signal is supplied as described later.
  • the power unit 1 having the aforementioned structure is connected to the emission unit 3.
  • the emission unit 3 includes, for example, a plurality of LEDs.
  • Each of the plural LEDs is, for example, a surface mount LED including an LED element, an encapsulating resin in which the LED element is encapsulated and a phosphor is dispersed, an input terminal and an output terminal.
  • the dimming level control unit 2 includes a signal rectifying part 22 one end of which is connected to the output terminal of the dimming level controller 200 through a terminal block (not shown).
  • the signal rectifying part 22 is supplied with a dimming level control signal corresponding to a control signal from the dimming level controller 200.
  • the dimming level control signal is a positive pulse signal and is a PWM signal having a different duty ratio in accordance with a dimming level (i.e., a level of brightness).
  • the signal rectifying part 22 rectifies the supplied dimming level control signal, and thus, the same dimming level control signal may be obtained regardless of a direction of connecting a signal line for the dimming level control signal to the terminal block (i.e., even when the signal line is connected to the terminal block in a reverse direction).
  • the other end of the signal rectifying part 22 is connected to one end of an insulating interface part (insulating I/F part) 23, and the other end of the insulating interface part 23 is connected to a conversion part 24 for converting a digital signal of the dimming level control signal into an analog voltage.
  • the insulating interface part 23 is, for example, a photo coupler, and since the side of the dimming level controller 200 and the side of the lighting apparatus 100 are thus electrically insulated from each other, the dimming level controller 200 (or the lighting apparatus 100) may be prevented from being affected by malfunction of a component of the lighting apparatus 100 (or the dimming level controller 200), so as to secure reliability and safety.
  • the conversion part 24 is a low-pass filter, and for example, a low-pass filter for cutting 100 Hz or more in a dimming level control signal of 1 kHz is used for converting a pulse signal into a voltage through integration, so that the control signal of the PWM signal supplied from the dimming level controller 200 may be converted into an analog voltage in accordance with the pulse width of the PWM signal.
  • the conversion part 24 is connected to one end of each of scaling amplifier parts 25 and 26.
  • the other end of the scaling amplifier part 25 is connected to the constant current control part 15.
  • the scaling amplifier part 25 is supplied with the dimming level control signal having been converted into the analog voltage by the conversion part 24.
  • the scaling amplifier part 25 transforms the voltage having been converted by the conversion part 24 into an analog voltage defined by the constant current control part 15, and outputs the transformed analog voltage to the constant current control part 15.
  • the set value of the constant current control part 15 is changed to a current value corresponding to the analog voltage supplied by the scaling amplifier part 25.
  • the other end of the scaling amplifier part 26 is connected to the constant voltage control part 16.
  • the scaling amplifier part 26 is supplied with the dimming level control signal having been converted into the analog voltage by the conversion part 24.
  • the scaling amplifier part 26 transforms the voltage having been converted by the conversion part 24 into an analog voltage defined by the constant voltage control part 16, and outputs the transformed analog voltage to the constant voltage control part 16.
  • the set value of the constant voltage control part 16 is changed to a voltage value corresponding to the analog voltage supplied by the scaling amplifier part 26.
  • the amplitudes of the output current and the output voltage of the power unit 1 are changed in accordance with the control signal in this manner, so that the emission unit 3 may be lit in accordance with the set current of the constant current control part 15 when the light quantity of the emission unit 3 is large and that the emission unit 3 may be lit in accordance with the set voltage of the constant voltage control part 16 when the light quantity of the emission unit 3 is small.
  • FIG. 3 is a diagram illustrating an example of a signal waveform employed in the principal part of the lighting apparatus 100 of Embodiment 1.
  • FIG. 3(a) illustrates a waveform of the supply voltage supplied to the power unit 1, in which the abscissa indicates time and the ordinate indicates the supply voltage V FIG.
  • FIG. 3(b) illustrates a control signal waveform supplied to the dimming level control unit 2 from the dimming level controller 200, in which the abscissa indicates time and the ordinate indicates the on/off of the control signal. It is noted that the control signal is expressed as one rectangular wave by simplifying a large number of pulse signals.
  • FIG. 3(c) illustrates a switching operation of the switching circuit part 14, in which the abscissa indicates time and the ordinate indicates the on/off of the switching operation.
  • the power control part 18 is constructed so as to make the switching circuit part 14 start the switching operation predetermined time Td after this point of time.
  • the emission unit 3 is lit in a dimming level control state according to the control signal.
  • a lighting start voltage attained at this time point is Vs.
  • the power control part 18 is constructed to stop the operation of the switching circuit part 14 when the detected voltage reaches a lighting finish voltage Vf.
  • the predetermined time Td is precedently set on the basis of delay time of the control signal illustrated in FIG. 3(b) .
  • FIG. 4 is a flowchart illustrating exemplified procedures in voltage control processing performed in starting the lighting apparatus 100.
  • a supply voltage V is detected in the supply voltage detection part 17 (step S1). It is determined by using the supply voltage V detected in step S1 whether or not the detected supply voltage V is not less than a predetermined value Vo (step S2). When it is determined in step S2 that the supply voltage V is not less than the predetermined value Vo (YES in step S2), the processing proceeds to step S3. On the other hand, when it is determined in step S2 that the supply voltage V is smaller than the predetermined value Vo (NO in step S2), the processing returns to step S1 so as to repeat this series of procedures.
  • step S3 a timer is started.
  • step S4 it is determined whether or not elapsed time T is not less than predetermined time Td (step S4).
  • the switching operation of the switching circuit part 14 is started (step S5) and the power control operation is terminated.
  • the processing returns to step S4 so as to repeat this series of procedures.
  • the power unit 1 is controlled in such a manner that the supply voltage externally supplied to the power unit 1 is detected and the power is supplied to the emission unit 3 the predetermined time Td after the detected voltage becomes the predetermined value Vo or more, and therefore, the emission unit 3 may be lit after the control signal is supplied.
  • the emission unit 3 is lit with a light quantity in accordance with the control signal from the beginning, and hence, a user may be prevented from feeling uncomfortable.
  • the minimum operation voltage of the emission unit 3, and more specifically, a minimum operation voltage of a circuit included in the power unit 1 at which the emission unit 3 is lit at the same time as the start of the operation of the power unit 1, is set as the predetermined value Vo.
  • the predetermined time Td is appropriately set on the basis of the delay time of the control signal, the structure in which the emission unit 3 may be lit definitely after the control signal is supplied may be attained.
  • the predetermined time Td may be not less than time elapsed from the time when the minimum operation voltage is attained until the time when the control signal is supplied from the dimming level controller 200, and in consideration of variation in electronic components, it is set to, for example, approximately 1 sec. in the case where the time elapsed from the time when the minimum operation voltage is attained until the time when the control signal is supplied from the dimming level controller 200 is approximately 700 msec.
  • the supply voltage externally supplied to the power unit 1 is detected and the power unit 1 is controlled to supply the power to the emission unit 3 the predetermined time Td after the detected voltage becomes the predetermined value Vo or more, and a control method for delaying the power supply to the emission unit 3 from the power unit 1 by predetermined time or more after the start of the power supply to the power unit 1 so as to light the emission unit 3 after the supply of the control signal is not limited to the method described above.
  • Another example of the control will now be described as Embodiment 2. Incidentally, the schematic structure of a principal part of a lighting apparatus is substantially the same as that of the lighting apparatus 100 of Embodiment 1, and hence the illustration and the description will be omitted.
  • FIG. 5 is a diagram illustrating an example of a signal waveform employed in the principal part of the lighting apparatus according to Embodiment 2 of the invention.
  • FIG. 5(a) illustrates a waveform of a supply voltage supplied to the power unit 1, in which the abscissa indicates time and the ordinate indicates the supply voltage V
  • FIG. 5(b) illustrates a control signal waveform supplied to the dimming level control unit 2 from the dimming level controller 200, in which the abscissa indicates time and the ordinate indicates the on/off of the control signal.
  • the control signal is expressed as one rectangular wave by simplifying a large number of pulse signals.
  • FIG. 5(c) illustrates a switching operation of the switching circuit part 14, in which the abscissa indicates time and the ordinate indicates the on/off of the switching operation.
  • the supply voltage of the power unit 1 rises and reaches a lighting start voltage Vs' corresponding to a set value.
  • the power control part 18 is constructed so as to start the switching operation of the switching circuit part 14 at this point of time. In accordance with this switching operation, the emission unit 3 is lit in a dimming level control state according to the control signal. Furthermore, the power control part 18 is constructed to stop the operation of the switching circuit part 14 when the detected voltage reaches a lighting finish voltage Vf.
  • the lighting start voltage Vs' corresponding to the set value is precedently set to a value of the supply voltage of the power unit 1 attained when the control signal is supplied, namely, a value (Vs') corresponding to an intersection point between a rising curve of the supply voltage of the power unit 1 and a line corresponding to time when the control signal is supplied (i.e., time when the control signal of FIG. 5(b) is turned on).
  • the lighting start voltage Vs' may be not less than the value of the supply voltage of the power unit 1 attained when the control signal is supplied, and in consideration of variation in electronic components, it is set more preferably with a small margin taken into account.
  • FIG. 6 is a flowchart illustrating alternate exemplified procedures in the power supply control processing performed in starting the lighting apparatus 100.
  • a supply voltage V is detected in the supply voltage detection part 17 (step S11).
  • the supply voltage V detected in step S11 is used for determining whether or not the detected supply voltage V is not less than a set value Vs' (step S12).
  • step S12 the switching operation of the switching circuit part 14 is started (step S13), and the power control operation is terminated.
  • the processing returns to step S11 so as to repeat this series of procedures.
  • the lighting apparatus 100 having the aforementioned structure is constructed in such a manner that the supply voltage externally supplied to the power unit 1 is detected and the power unit 1 is controlled so as to supply the power to the emission unit 3 after the detected voltage becomes the set value Vs' or more, and therefore, the emission unit 3 may be lit after the supply of the control signal under simple control performed through determination with one threshold value, and thus, a user may be prevented from feeling uncomfortable. Furthermore, since the value of the supply voltage supplied to the power unit 1 at the time point when the control signal is supplied is used as the set value, the emission unit 3 may be lit after the supply of the control signal while suppressing delay time.
  • the supply voltage of the power unit 1 detected by the supply voltage detection part 17 is used for the control for lighting the emission unit 3 after the control signal is externally supplied, which does not limit the invention, and it may be used, for example, for what is called fade-in switching control in which power to be supplied to the emission unit 3 is gradually increased in starting the lighting apparatus so as to light it with defined illumination after predetermined time. This control will now be described.
  • FIG. 7 is a block diagram illustrating another example of the schematic structure of a principal part of a lighting apparatus.
  • a power control part 18 is connected between a conversion part 24 and scaling amplifier parts 25 and 26 of a dimming level control unit 2a.
  • the power control part 18 when the power control part 18 detects power supply to a power unit 1 on the basis of a supply voltage detected by a supply voltage detection part 17 (namely, when the supply voltage V is larger than 0), it first supplies an analog voltage value corresponding to, for example, a dimming level of 5% to each of the scaling amplifier parts 25 and 26, and thereafter, it supplies analog voltage values corresponding to dimming levels gradually increased at predetermined time intervals, so as to attain a dimming level set in accordance with the control signal after predetermined time.
  • the power control part 18 detects break of the power supply to the power unit 1 on the basis of the supply voltage detected by the supply voltage detection part 17 (namely, when the supply voltage V is lowered to a voltage Vf), the power control part 18 supplies, to each of the scaling amplifier parts 25 and 26, analog voltage values corresponding to dimming levels gradually lowered from, for example, an analog voltage value corresponding to a current dimming level so as to attain a dimming level of 0% after predetermined time.
  • the remaining structure is the same as that of the lighting apparatus 100 according to Embodiment 1 illustrated in FIG. 2 , and hence, like reference numerals are used to refer to corresponding elements so as to omit the detailed description.
  • the power control part 18 is constructed so that a current and/or a voltage to be supplied to the emission unit 3 may be gradually increased (or gradually decreased) by using the supply voltage detected by the supply voltage detection part 17 in accordance with the start (or finish) of power supply to the power unit 1, and thus, the brightness is gradually changed and hence a user may be prevented from feeling uncomfortable.
  • the dimming level control may be finely performed.
  • a plurality of lighting apparatuses may be connected to one dimming level controller.
  • a lighting system in which a plurality of lighting apparatuses installed in the room may be controlled by one dimming level controller provided on a wall is employed, and the lighting apparatus of the invention may be used in such a lighting system.
  • the circuit configurations, the delay time of the control signal and the like mentioned in the aforementioned embodiments are merely exemplarily described, and they are different in accordance with the type of a dimming level controller connected to the lighting apparatus but may be set by a similar way.
  • the surface mount LED is used as the light source of the emission unit in each of the aforementioned embodiments, the light source is not limited to this but another type of LED may be used.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP10802212.0A 2009-07-21 2010-07-15 Dispositif d éclairage Withdrawn EP2458944A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009170452A JP4864122B2 (ja) 2009-07-21 2009-07-21 照明装置及び照明システム
PCT/JP2010/061953 WO2011010592A1 (fr) 2009-07-21 2010-07-15 Dispositif d’éclairage

Publications (2)

Publication Number Publication Date
EP2458944A1 true EP2458944A1 (fr) 2012-05-30
EP2458944A4 EP2458944A4 (fr) 2014-04-16

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EP10802212.0A Withdrawn EP2458944A4 (fr) 2009-07-21 2010-07-15 Dispositif d éclairage

Country Status (6)

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US (1) US8786212B2 (fr)
EP (1) EP2458944A4 (fr)
JP (1) JP4864122B2 (fr)
KR (1) KR101423403B1 (fr)
CN (1) CN102474945B (fr)
WO (1) WO2011010592A1 (fr)

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US8729815B2 (en) * 2012-03-12 2014-05-20 Osram Sylvania Inc. Current control system
US9565782B2 (en) 2013-02-15 2017-02-07 Ecosense Lighting Inc. Field replaceable power supply cartridge
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US9869450B2 (en) 2015-02-09 2018-01-16 Ecosense Lighting Inc. Lighting systems having a truncated parabolic- or hyperbolic-conical light reflector, or a total internal reflection lens; and having another light reflector
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KR101423403B1 (ko) 2014-07-24
CN102474945B (zh) 2014-10-15
WO2011010592A1 (fr) 2011-01-27
US8786212B2 (en) 2014-07-22
US20120268037A1 (en) 2012-10-25
JP4864122B2 (ja) 2012-02-01
EP2458944A4 (fr) 2014-04-16
JP2011028863A (ja) 2011-02-10
CN102474945A (zh) 2012-05-23
KR20120038502A (ko) 2012-04-23

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